Eur. Phys. J. Appl. Phys.
Volume 36, Number 3, December 2006
|Page(s)||285 - 287|
|Section||Characterization of Materials: Imaging, Microscopy and Spectroscopy|
|Published online||06 December 2006|
Optical and EPR spectroscopy in pure and blended films of a novel low band gap polymer*
University of Antwerp, Physics Department, CDE,
Universiteitsplein 1, 2610 Antwerp, Belgium
2 Hasselt University, Institute for Materials Research (IMO), Agoralaan Bld. D, 3590 Diepenbeek, Belgium
3 IMEC, Division IMOMEC, Wetenschapspark 1, 3590 Diepenbeek, Belgium
Corresponding author: email@example.com
Accepted: 2 October 2006
Published online: 6 December 2006
Efficient charge transfer between a newly synthesized low band gap (LBG) conjugated polymer and the C60 derivative PCBM is demonstrated. Spectral and time-resolved photoluminescence (PL) measurements show strong quenching and charge separation in the picosecond time range. The charge transfer is further confirmed by light-induced electron paramagnetic resonance (EPR) measurements of both the positive polarons and the fullerene radicals, which can be resolved in high-frequency EPR. The potential for the LBG polymer to act as acceptor was examined in blends with the para-phenylene-vinylene polymer MDMO-PPV. No charge transfer, but instead energy transfer from MDMO-PPV to LBG occurs in these blends, as shown by PL spectroscopy.
PACS: 76.30.-v – Electron paramagnetic resonance and relaxation / 78.66.Qn – Polymers; organic compounds / 81.05.Zx – New materials: theory, design, and fabrication
© EDP Sciences, 2006
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